[Mailman-Users] DMARC victim example?

Mark Sapiro mark at msapiro.net
Mon Apr 14 03:35:09 CEST 2014

On 04/13/2014 03:22 PM, Peter Shute wrote:
> We just had a list member disabled. Is this likely to be caused by the DMARC problem? Here's the header from the attachment in the bounce action notification email:
> <xxxxx.xxx at gmail.com> (expanded from <xxxxx at xxxxx.com.au>): host
>     gmail-smtp-in.l.google.com[2607:f8b0:400e:c03::1b] said: 550-5.7.1
>     [2400:8900::f03c:91ff:fedb:b1ff      12] Our system has detected that
>     550-5.7.1 this message is likely unsolicited mail. To reduce the amount of
>     spam 550-5.7.1 sent to Gmail, this message has been blocked. Please visit
>     550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131
>     for 550 5.7.1 more information. cb4si7487232pbc.409 - gsmtp (in reply to
>     end of DATA command)

In my experience, based on three posts on Sat, 5 Apr, From: a yahoo.com
address to a list which has about 240 individual message deliveries per
post, about 90 of those to about 8 domains bounced. gmail.com was not
one of the domains that bounced the posts. Gmail may have changed it's
behavior in the last 8 days, but this reason doesn't look like the ones
I've seen. E.g.:

aol.com/netscape.net/compuserve.com: 521 5.2.1 :  (DMARC) This message
failed DMARC Evaluation and is being refused due to provided DMARC Policy

yahoo.com/sbcglobal.net: 554 5.7.9 Message not accepted for policy
reasons.  See http://postmaster.yahoo.com/errors/postmaster-28.html

comcast.net: 550 5.2.0 mfuB1n01M0MH6DU0XfuCv5 Message rejected due to
DMARC. Please see

hotmail.com/msn.com: 550 5.7.0 (BAY0-MC3-F56) Unfortunately, messages
from ( on behalf of (yahoo.com) could not be delivered due
to domain owner policy restrictions.

Bottom line: I don't think this is a DMARC bounce.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

More information about the Mailman-Users mailing list